The side-chain and backbone dynamics of two model polymines, polylysine (PL) and poly(allylamine) (PAM), is examined with time-resolved fluorescence anisotropy (TRFA) in aqueous solution and when the polyamines are entrapped into sol-gel derived silica. The findings indicate that the dynamics of proteins entrapped in silica must be viewed with caution, as it is possible to have a significant dynamic motion even when proteins interact with the matrix.

Excited-state amine-imine double proton transfer in 7-azaindoline

Article Abstract:

Ground-state thermodynamics and excited-state amine/imine tautomerism in 7-azaindoline mediated by hydrogen bond formation are studied by means of absorption and emission spectrocopies. The results in combination with a comparative study on 7-azaindole, generalize the amine/imine tautomerism, which could be fine-tuned by the length of pie electron conjugation coupled with types associated guest molecules.

The photophysical properties, electrochemistry, and electrogenerated chemiluminescence (ECL) of two different ter(9,9-diarylfluorene)s, TDAF is reported. In this process, the formation of excimers was mainly from a reaction of oppositely charged radical ions.